JPH02217976A - Bar code reader - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a barcode reader.

(Prior art) As is well known, 5 patterns M! As one method of identification, an identification bar code is sometimes formed on a sheet and the data is read by optically scanning this bar code.

In the pattern recognition method described above, it is assumed to be in a stationary state,
A barcode reader is used that includes a laser scanner that irradiates a laser beam onto a barcode and receives reflected light from the barcode.

(Problem to be Solved by the Invention) By the way, in the above-mentioned barcode reader, when starting laser beam irradiation, a single trigger (number n) is input from the active part, and this 1-trigger signal is input. This allows a continuous irradiation state to be maintained until the reading is completed. If the dirt is not consistent, there is a risk that accurate data reading may not be possible6. In this case, the parts to be transported are transported to various processes, so determining the specifications of the parts at each transport position depends on the parts at that transport position. It is controlled by the information control unit that manages the work.Therefore, when the information control unit determines that one part has been sent to the transport position, it sends an opening trigger signal to the barcode reader. However, if the positional relationship between the part and the barcode reader is incorrect, the barcode is heavily soiled, or there is a missing barcode, it will become unreadable, and this state will cause the continuous laser beam to fail. Even after repeated irradiation, there was no improvement, and as a result, the barcode reading time set in the information control unit was exceeded, and an error occurred in the reading at the conveyance position.

Transport will be interrupted. Therefore, in this case, the subsequent parts transport will be delayed, resulting in loss time in the entire transport line and significantly reducing work efficiency.

SUMMARY OF THE INVENTION In view of the above-mentioned problems with conventional barcode readers, an object of the present invention is to provide a barcode reader that can perfectly read barcodes displayed as data.

(Means for Solving the Problem) In order to achieve this object, the present invention provides a barcode reader that optically scans a barcode formed on a sheet to read barcode information. comprising: a scanner equipped with a light receiving section for reflected light; and a manual control section that is electrically connected to the scanner and the barcode analysis section and outputs a trigger signal for starting irradiation to the scanner; The active control unit outputs a trigger signal that repeats irradiation start and irradiation stop for a predetermined period of time, and at the time when a read completion signal from the barcode is inputted when the trigger signal is repeatedly output. This is a proposal to stop the output.

(Function) According to the present invention, optical scanning of a barcode is repeatedly performed until a reading completion signal is obtained.

(Embodiment) Hereinafter, details of an embodiment of the present invention will be explained with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram for explaining the overall configuration of a barcode reader according to an embodiment of the present invention.

The barcode reader 1 in this embodiment is used in an assembly line for automatic heavy-duty engine parts,
Scanner IA, reader main body IB and immediate action control unit 2
is the main part.

That is, the scanner IA is constituted by a laser scanner of a well-known structure that includes a laser irradiation section and a light receiving section inside, and is electrically connected to the reader main body IB. The reader main body 1B is equipped with a circuit for amplifying the active current in the scanner IA, and applies a north current to the scanner IA in response to a trigger signal from the opening control section 2, which will be described later. This enables the irradiation of laser light.

On the other hand, in the case of this embodiment, the above-mentioned active control unit 2 is constituted by a sequencer that is located in a part of the engine parts assembly process and controls each equipment in the assembly process.
To output the opening current to the reader main body IB, output the trigger signal and read signal from the scanner IA.
Information is transferred to and from the intermediate controller 3 for managing the assembly process described above.

Then, the shame motion control unit 2 described above outputs a trigger signal to the reader main body IB to repeatedly set the on state for 1, for example, 2 seconds and the off state for 0.5 seconds as shown in the second diagram. At the same time, when reading a barcode via the scanner IA, its characteristics are set so that the output of the trigger signal to the reader main body IB is stopped at the time when a reading completion signal for the barcode is input.

Since this embodiment has the above structure, the assembly line (
(not shown), when it is detected that the engine parts have been transported, the drive control unit 2 outputs a trigger signal as shown in the second diagram to the reader main body IB according to a command from the intermediate controller 3. do. Therefore, in the reader main body IB, from the point indicated by the symbol A in FIG.
Since laser irradiation is performed at point A, the same state is obtained as if the barcode had been read multiple times within the reading time set by the drive control unit 2.

On the other hand, when the reading completion mark displayed on the barcode is read by the scanner IA as shown by the symbol B in FIG. Since the signal is input to the drive control section 2, the drive control section 2 stops outputting the trigger signal to the reader main body IB.

(Effects) As described above, according to the present invention, when reading with a scanner, it is possible to set the number of optical scans to be the same as repeating multiple times within a preset reading time. , Even if the reading was incomplete in the previous round, reading can be started again, so the probability of obtaining a reading completion can be improved, thereby ensuring a complete reading. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the overall configuration of a barcode reader according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining the characteristics of main parts of the block shown in FIG. 1. 1... Barcode reader, 1^... Scanner I
B...Reader body, 2...Drive control section, 3...
intermediate controller.

Claims (1)

[Scope of Claims] A barcode reader that reads barcode information by optically scanning a barcode formed on a sheet, comprising: a scanner including a light emitting section and a reflected light receiving section; A drive control unit is electrically connected to the barcode analysis unit and outputs a trigger signal for starting irradiation to the scanner, and the drive control unit starts irradiation and stops irradiation at a predetermined time. A barcode reader characterized in that it outputs a repeated trigger signal, and stops outputting the trigger signal at the time when a reading completion signal from the barcode is input when the trigger signal is repeatedly output.